Tom, I had the same problem on my 64. I bought some flat sheet, cutout the width I needed and formed it to match the channel that I cut off the door. I used a long straight piece of steel and rounded one edge to create the inside radius of the channel. I didn't measure it, I just made it the same width. I made it look exactly like the old channel, but I didn't really need to put in all time and effort to make the scallops. I drilled holes in the channel and welded it to the bottom of the door. I met a guy at the Reno Hot August nights that told me he just cutout off the channel and attached the weatherstripping using the black adhesive. Probably would work, but I made the channels instead.
Larry